One of blockchains biggest challenges is the security risks from hackers due to lack of identity and trust verifier.
How can this be solve?
What are you talking about? did you mean the highest security in blockchain need to record everyone KYC? it's a joke since someone can fake their KYC and KYC will become useless. Not to mention the hacker can hack the blockchain to get every KYC of people who submitted before and the hacker will use their KYC to make them in trouble. So does KYC will become a solution for to track the hacker? obviously not.